Autonomous Map Traversal with Waypoint Matching

ABSTRACT

A robot includes a drive system configured to maneuver the robot about an environment and data processing hardware in communication with memory hardware and the drive system. The memory hardware stores instructions that when executed on the data processing hardware cause the data processing hardware to perform operations. The operations include receiving image data of the robot maneuvering in the environment and executing at least one waypoint heuristic. The at least one waypoint heuristic is configured to trigger a waypoint placement on a waypoint map. In response to the at least one waypoint heuristic triggering the waypoint placement, the operations include recording a waypoint on the waypoint map where the waypoint is associated with at least one waypoint edge and includes sensor data obtained by the robot. The at least one waypoint edge includes a pose transform expressing how to move between two waypoints.

CROSS REFERENCE TO RELATED APPLICATIONS

This U.S. patent application is a continuation of, and claims priorityunder 35 U.S.C. § 120 from, U.S. patent application Ser. No. 16/295,592,filed on Mar. 7, 2019, which claims priority under 35 U.S.C. § 119(e) toU.S. Provisional Application 62/745,013, filed on Oct. 12, 2018, each ofwhich is hereby incorporated by reference in its entirety.

TECHNICAL FIELD

This disclosure relates to autonomous map traversal with waypointmatching.

BACKGROUND

A robot is generally defined as a reprogrammable and multifunctionalmanipulator designed to move material, parts, tools, or specializeddevices through variable programmed motions for a performance of tasks.Robots may be manipulators that are physically anchored (e.g.,industrial robotic arms), mobile robots that move throughout anenvironment (e.g., using legs, wheels, or traction based mechanisms), orsome combination of a manipulator and a mobile robot. Robots areutilized in a variety of industries including, for example,manufacturing, transportation, hazardous environments, exploration, andhealthcare. As such, the ability to operate autonomously may enhance arobots functionality and provide additional benefits to such industries.

SUMMARY

One aspect of the disclosure provides a method for autonomous maptraversal. The method includes receiving, at data processing hardware,sensor data of an environment about a robot maneuvering in theenvironment. The sensor data includes image data. The method alsoincludes executing, by the data processing hardware, at least onewaypoint heuristic based on the image data. The at least one waypointheuristic is configured to trigger a waypoint placement on a waypointmap. In response to the at least one waypoint heuristic triggering thewaypoint placement, the method includes recording, by the dataprocessing hardware, a waypoint on the waypoint map. The waypoint isassociated with at least one waypoint edge and includes at least some ofthe sensor data obtained by the robot. The at least one waypoint edgeincludes a pose transform expressing how to move between two waypoints.

Implementations of the disclosure may include one or more of thefollowing optional features. In some implementations, the image dataincludes three-dimensional point cloud data captured by athree-dimensional volumetric image sensor. Here, the three-dimensionalvolumetric image sensor may include one or more of a stereo camera, ascanning light-detection and ranging (LIDAR) sensor, or a scanninglaser-detection and ranging (LADAR) sensor. The waypoint heuristic maybe configured to detect a threshold feature detection within the imagedata at a current location of the robot.

In some examples, the sensor data of the waypoint includesthree-dimensional point cloud data captured by a three-dimensionalvolumetric image sensor and pose data including inertial measurementdata measured by an inertial measurement unit (IMU) of the robot. For agiven waypoint, the method may include identifying neighboring waypointsto the given waypoint and identifying three-dimensional points of thethree-dimensional point cloud data of the given waypoint and theneighboring waypoints as a collection of three-dimensional points. For agiven waypoint, the method may also include determining whether thethree-dimensional points of the collection of three-dimensional pointscorrespond to a visual edge of an image represented by thethree-dimensional point cloud data and associating with the givenwaypoint the three-dimensional points of the collection ofthree-dimensional points that correspond to the visual edge of the imagerepresented by the three-dimensional point cloud data.

In some configurations, the waypoint includes a robot pose constraintconfigured to cause the robot to achieve an oriented pose at thewaypoint. The waypoint map may be locally consistent with neighboringwaypoints. The waypoint edge may include an annotation indicating aspatial feature of the environment. Recording the waypoint on thewaypoint map include recording a basin zone around the waypoint, thebasin zone designating an area adjacent to the waypoint where a robot isconfigured to use an iterative closest points (ICP) algorithm.

Another aspect of the disclosure provides a robot. The robot includes adrive system configured to maneuver the robot about an environment anddata processing hardware in communication with the drive system. Therobot also includes memory hardware in communication with the dataprocessing hardware. The memory hardware stores instructions that whenexecuted on the data processing hardware cause the data processinghardware to perform operations. The operations include receiving sensordata of the robot maneuvering in the environment. The sensor dataincludes image data. The operations further include executing at leastone waypoint heuristic based on the image data. The at least onewaypoint heuristic is configured to trigger a waypoint placement on awaypoint map. In response to the at least one waypoint heuristictriggering the waypoint placement, the operations include recording awaypoint on the waypoint map. The waypoint is associated with at leastone waypoint edge and includes sensor data obtained by the robot. The atleast one waypoint edge includes a pose transform expressing how to movebetween two waypoints.

Implementations of the disclosure may include one or more of thefollowing optional features. In some examples, the image data includesthree-dimensional point cloud data captured by a three-dimensionalvolumetric image sensor. Here, the image sensor includes one or more ofa stereo camera, a scanning light-detection and ranging (LIDAR) sensor,or a scanning laser-detection and ranging (LADAR) sensor. The waypointheuristic may be configured to detect a threshold feature detectionwithin the image data at a current location of the robot.

In some implementations, the sensor data of the waypoint includesthree-dimensional point cloud data captured by a three-dimensionalvolumetric image sensor and pose data including inertial measurementdata measured by an inertial measurement unit (IMU) of the robot. For agiven waypoint, the operations may include identifying neighboringwaypoints to the given waypoint and identifying three-dimensional pointsof the three-dimensional point cloud data of the given waypoint and theneighboring waypoints as a collection of three-dimensional points. For agiven waypoint, the operations may also include determining whether thethree-dimensional points of the collection of three-dimensional pointscorrespond to a visual edge of an image represented by thethree-dimensional point cloud data and associating with the givenwaypoint the three-dimensional points of the collection ofthree-dimensional points that correspond to the visual edge of the imagerepresented by the three-dimensional point cloud data.

In some configurations, the waypoint includes a robot pose constraintconfigured to cause the robot to achieve an oriented pose at thewaypoint. The waypoint map may be locally consistent with neighboringwaypoints. Additionally or alternatively, the waypoint edge may includean annotation indicating a spatial feature of the environment. Recordingthe waypoint on the waypoint map may include recording a basin zonearound the waypoint, the basin zone designating an area adjacent to thewaypoint where a robot is configured to use an iterative closest points(ICP) algorithm.

Yet another aspect of the disclosure provides a method for autonomousmap traversal. The method includes receiving, at data processinghardware, image data of an environment about a robot maneuvering in theenvironment. The method also includes executing, by the data processinghardware, an iterative closest points (ICP) algorithm configured tolocalize to a first waypoint of a waypoint map based on the receivedimage data. The method further includes executing, by the dataprocessing hardware, a traversal path from the first waypoint of thewaypoint map to a second waypoint of the waypoint map and updating, bythe data processing hardware, a localization to the second waypoint ofthe waypoint map by the ICP algorithm based on the received image data.

Implementations of this aspect of the disclosure may include one or moreof the following optional features. In some configurations, the imagedata includes three-dimensional point cloud data captured by athree-dimensional volumetric image sensor. The image sensor may includeone or more of a stereo camera, a scanning light-detection and ranging(LIDAR) sensor, or a scanning laser-detection and ranging (LADAR)sensor.

In some examples, updating the localization to the second waypointincludes comparing the received image data with stored image data of thewaypoint map, the stored image data associated with the second waypoint.Additionally or alternatively, updating the localization to the secondwaypoint may include determining that a location associated with thelocalization satisfies a localization distance threshold and executing,by the data processing hardware, localization at the location accordingto kinematic data and inertial measurement data. Here, the localizationdistance threshold indicates a distance from a respective waypoint.

Another aspect of the disclosure provides a robot. The robot includes abody, legs coupled to the body and configured to maneuver the robotabout an environment, and data processing hardware in communication withthe legs. The robot also includes memory hardware in communication withthe data processing hardware. The memory hardware stores instructionsthat when executed on the data processing hardware cause the dataprocessing hardware to perform operations. The operations includereceiving image data of an environment about a robot maneuvering in theenvironment. The operations also include executing an iterative closestpoints (ICP) algorithm configured to localize to a first waypoint of awaypoint map based on the received image data and executing a traversalpath from the first waypoint of the waypoint map to a second waypoint ofthe waypoint map. The operations further include updating a localizationto the second waypoint of the waypoint map by the ICP algorithm based onthe received image data.

Implementations of this aspect of the disclosure may include one or moreof the following optional features. In some implementations, the imagedata includes three-dimensional point cloud data captured by athree-dimensional volumetric image sensor. Here, the image sensorincludes one or more of a stereo camera, a scanning light-detection andranging (LIDAR) sensor, or a scanning laser-detection and ranging(LADAR) sensor.

In some examples, updating the localization to the second waypointincludes comparing the received image data with stored image data of thewaypoint map, the stored image data associated with the second waypoint.Optionally, updating the localization to the second waypoint may alsoinclude determining that a location associated with the localizationsatisfies a localization distance threshold and executing, by the dataprocessing hardware, localization at the location according to kinematicdata and inertial measurement data. Here, the localization distancethreshold indicates a distance from a respective waypoint.

The details of one or more implementations of the disclosure are setforth in the accompanying drawings and the description below. Otheraspects, features, and advantages will be apparent from the descriptionand drawings, and from the claims.

DESCRIPTION OF DRAWINGS

FIG. 1 is a schematic view of an example of a robot in a roboticenvironment.

FIG. 2A is a schematic view of an example of a map for the robot.

FIG. 2B is a schematic view of an example waypoint of a map with abasin.

FIG. 2C is a schematic view of example map with map constraints.

FIG. 2D is a schematic view of an example map for the robot.

FIGS. 3 and 4 are flow diagrams of example arrangements for implementingrobotic environment traversal for the robot.

FIG. 5 is a schematic view of an example computing device that may beused to implement the systems and methods described herein.

Like reference symbols in the various drawings indicate like elements.

DETAILED DESCRIPTION

FIG. 1 is an example of a robotic environment 10. The roboticenvironment 10 generally refers to a spatial area associated with sometype of terrain that may be traversed by a robot 100 according to a map200. For example, the terrain is an urban terrain, such as buildings,streets, sidewalks, parks, alleys, stairs, ramps, tunnels, etc., a ruralterrain, such as roads, fields, hills, mountains, caves, etc., asubterranean terrain, such as caves, tunnels, etc., or any combinationthereof. The robot 100 includes locomotion based structures such as legsand/or wheels attached to a body that enable the robot 100 to move aboutthe robotic environment 10. Although FIG. 1 depicts a quadruped robotwith four legs 103, 104, 106, 108, the robot 100 may include any numberof legs or locomotive based structures (e.g., a biped or humanoid robotwith two legs) that provides a means to traverse the robotic environment10.

In some implementations, the robot 100 includes computing hardware 110and at least one sensor system 120. The computing hardware 110 generallyincludes data processing hardware 112 and memory hardware 114. Thecomputing hardware 110 is configured to control a robot traversal system116. The robot traversal system 116 operates a behavior system 102 ofthe robot 100 to move the robot 100 about the robotic environment 10.The behavior system 102 is generally responsible for controlling (i.e.executing) behaviors of the robot 100. For example, the behavior system102 controls different footstep patterns, leg patterns, body movementpatterns, or vision system sensing patterns. The robot traversal system116 operates the behavior system 102 based on at least one map 200provided to the robot traversal system 116.

The traversal system 116 is configured to communicate with the memoryhardware 114 of the robot 100 to provide the map 200 to operate thebehavior system 102 using the data processing hardware 112 of the robot100. In some examples, the memory hardware 114 stores the map 200locally on the robot 100. In other examples, the map 200 is storedand/or accessed remotely by the traversal system 116. For example, thetraversal system 116 communicates via a network 130 with a remote system140. The remote system 140 may be a server or cloud-based environmentthat includes remote resources 142 such as remote data processinghardware 144 and remote memory hardware 146. In some implementations,the map 200 is stored and/or processed on the remote system 140 usingremote resources 142 and is communicated to the traversal system 116 ofthe robot 100 via the network 130. In yet other examples, differentparts of the map 200 are processed and/or stored remotely (e.g., via theremote system 140) and locally (e.g., via the computing hardware 110).

The sensor system 120 includes one or more sensors 122, 122 a-n. Thesensors 122 may include vision/image sensors, inertial sensors (e.g., aninertial measurement unit (IMU)), and/or kinematic sensors. Someexamples of sensors 122 include a camera such as a stereo camera, ascanning light-detection and ranging (LIDAR) sensor, or a scanninglaser-detection and ranging (LADAR) sensor. In some examples, the sensor122 has a corresponding field(s) of view F_(v) defining a sensing rangeor region corresponding to the sensor 122. For instance, FIG. 1 depictsa field of a view F_(V) for the robot 100. Each sensor 122 may bepivotable and/or rotatable such that the sensor 122 may, for example,change the field of view F_(V) about one or more axis (e.g., an x-axis,a y-axis, or a z-axis in relation to a ground plane G). In someimplementations, the body of the robot 100 includes a sensor system 120with multiple sensors 122 about the body to gather sensor data 124 inall directions around the robot 100. For example, the quadruped robotdepicted in FIG. 1 includes a sensor 122 on its chest 122 a, a sensor122 on each side 122 n (only one side depicted), and a sensor 122 on itsretractable hand 122 b. The robot 100 may include any number of sensors122 as part of the sensor system 120 in order to generate sensor data124 for the robotic environment 10 about the robot 100.

When surveying a field of view F_(V) with a sensor 122, the sensorsystem 120 generates sensor data 124 corresponding to the field of viewF_(V). In some examples, the sensor data 124 is image data thatcorresponds to a three-dimensional volumetric point cloud generated by athree-dimensional volumetric image sensor 122. Additionally oralternatively, when the robot 100 is maneuvering about the roboticenvironment 10, the sensor system 120 gathers pose data for the robot100 that includes inertial measurement data (e.g., measured by an IMU).In some examples, the pose data includes kinematic data and/ororientation data about the robot 100.

Sensor data 124 gathered by the sensor system 120, such as the imagedata, pose data, inertial data, kinematic data, etc., relating to therobotic environment 10 may be communicated to the computing hardware 110(e.g., the data processing hardware 112 and memory hardware 114) of therobot 100. In some examples, the sensor system 120 gathers and storesthe sensor data 124 (e.g., in the memory hardware 114 or memory hardware146 of remote resources 142). In other examples, the sensor system 120gathers the sensor data 124 in real-time and processes the sensor data124 without storing raw (i.e., unprocessed) sensor data 124. In yetother examples, the computing hardware 110 and/or remote resources 142store both the processed sensor data 124 and raw sensor data 124.

FIGS. 2A-2D are examples of maps 200, 200 a-d generated by the robot 100and/or remote system 140. Each map 200 is a representation of anenvironment (e.g., the robotic environment 10) used to autonomouslyguide the robot 100. The robot 100 (or the remote system 140) generatesthe map 200 by receiving the image data 124 of the robotic environment10 captured by one or more vision sensors 122, 122 a-c of the sensorsystem 120 as the robot 100 maneuvers about the robotic environment 10as shown in FIG. 1 . In some examples, the robot 100 generates the map200 with computing hardware 110, while in other examples, the remotesystem 140 generates the map 200 with remote resources 142. Once eitherthe computing hardware 110 or the remote system 140 generates the map200, the map 200 is communicated to the traversal system 116 to executethe behavior system 102 of the robot 100. Here, the behavior system 102controls the robot 100 to traverse within the robotic environment 10according to the map 200. The map 200 may be generated by the same robot100 that traverses the robotic environment 10 or a different robot.

Some advantages of the map 200 may be used immediately, repeatedly,and/or transferrably for another robot with a similar sensor system 120.Here, the map 200 requires no final optimization once all the sensordata 124 has been collected. Furthermore, the robot 100 may autonomouslynavigate the robotic environment 10 using the map 200 without globalpositioning information or other navigation data from a beacon. Each map200 may be automatically processed by the systems of the robot 100 (orthe remote system 140) or manually processed (e.g., editing waypoints210, edges 220, basins 230 (FIG. 2B), constraints 240 (FIG. 2C), etc.).This enables the map 200 to be flexible to include additional data(e.g., annotations 222) or to provide adjusted robotic behaviors (e.g.,suppressing ICP localization in feature-less areas). Moreover, modifyingwaypoints 210 or edges 220 of the map 200 (e.g., by adding, editing, orremoving) should have no effect on non-modified portions of the map 200,and thus, simplifying quality control.

The map 200 includes waypoints 210 and edges 220 (also referred to aswaypoint edges) forming connections between waypoints 210. A waypoint210 is a representation of what the robot 100 sensed (e.g., according toits sensor system 120) at a particular place within the roboticenvironment 10. The robot 100 and/or remote system 140 generateswaypoints 210 based on the image data 124 collected by the sensor system120 of the robot. Because the map 200 is generated by waypoints 210, themap 200 may be locally consistent (e.g., spatially consistent within anarea due to neighboring waypoints), but does not need to be globallyaccurate and/or consistent.

With the image data 124, the robot 100 and/or remote system 140 executesat least one waypoint heuristic 212 (FIG. 1 ) (e.g., waypointalgorithm). The at least one waypoint heuristic 212 is configured totrigger a waypoint placement on the map 200. For example, the waypointheuristic 212 is configured to detect a threshold feature detectionwithin the image data 124 at a location of the robot 100 (e.g., whengenerating or updating the map 200). The waypoint heuristic 212 mayidentify features within the robotic environment 10 that function asreliable vision sensor features offering repeatability for the robot 100to maneuver about the robotic environment 10. For instance, the waypointheuristic 212 is pre-programmed for feature recognition (e.g.,programmed with stored features) or programmed to identify featureswhere spatial clusters of volumetric image data 124 occur (e.g., cornersof rooms or edges of walls). In response to the at least one waypointheuristic 212 triggering the waypoint placement, the robot 100 and/orremote system 140 records the waypoint 210 on the map 200. This waypointidentification process may be repeated as the robot 100 is manuallydriven through an area (e.g., the robotic environment 10). In someexamples, the robot 100 and/or remote system 140 stores a plurality ofmaps 200 generated for areas that the robot 100 has previously sensed(via its sensor system 120).

Each waypoint 210 is generally associated with a waypoint edge 220. Morespecifically, an edge 220 is configured to indicate how one waypoint 210(e.g., a first waypoint 210 a) is related to another waypoint 210 (e.g.,a second waypoint 210 b). For example, the edge 220 represents apositional relationship between waypoints 210 (e.g., adjacent waypoints210). In other words, the edge 220 is a connection between two waypoints210 (e.g., the edge 220 a shown in FIG. 2A as a connection between afirst waypoint 210 a and a second waypoint 210 b). For instance, theedge 220 is a path (e.g., a movement path for the robot 100) between thefirst waypoint 210 a to the second waypoint 210 b. In some examples,each edge 220 includes a pose transform that expresses how the robot 100moves along the edge 220 between two waypoints 210. Pose transformationsmay describe a position and/or orientation of one coordinate framewithin an environment relative to another coordinate frame. In someimplementations, the edge 220 includes a full three-dimensionaltransform (e.g., six numbers). Some of these numbers include variousestimates such as, for example, a dead reckoning pose estimation, avision based estimation, or other estimations based on kinematics and/orinertial measurements of the robot 100.

In some examples, the edge 220 includes annotations 222 associated withthe edge 220 that provide further indication/description of the roboticenvironment 10. Some examples of annotations 222 include a descriptionor an indication that an edge 220 is located on stairs or crosses adoorway. These annotations 222 may aid the robot 100 during maneuveringespecially when visual information is missing or lacking (e.g., a voidsuch as a doorway). In some configurations, the annotations 222 includedirectional constraints (also may be referred to as pose constraints). Adirectional constraint of the annotation 222 may specify an alignmentand/or an orientation (e.g., a pose) of the robot 100 at a particularenvironment feature. For example, the annotation 222 specifies aparticular alignment or pose for the robot 100 before traveling alongstairs or down a narrow corridor which may restrict the robot 100 fromturning.

In some implementations, each waypoint 210 of the map 200 also includessensor data 124 corresponding to data collected by the sensor system 120of the robot 100 when the robot 100 sensed the robotic environmentforming the map 200. Here, the sensor data 124 at a waypoint 210 enablesthe robot 100 to localize by comparing real-time sensor data 124gathered as the robot 100 traverses the robotic environment 10 accordingto the map 200 with sensor data 124 stored for the waypoints 210 of themap 200. In some configurations, after the robot 100 moves along an edge220 (e.g., with the intention to be at a target waypoint 210), the robot100 is configured to localize by directly comparing real-time sensordata 124 with the map 200 (e.g., sensor data 124 associated with theintended target waypoint 210 of the map 200). Here, by storing raw ornear-raw sensor data 124 with minimal processing for the waypoints 210of the map 200, the robot 100 may use real-time sensor data 124 tolocalize efficiently as the robot 100 maneuvers within the mappedrobotic environment 10. In some examples, an iterative closest points(ICP) algorithm localizes the robot 100 with respect to a waypoint 210.

The sensor data 124 may also allow the initialization of the robot 100to autonomously traverse the robotic environment 10 using the map 200.In some examples, the robot 100 initially receives a hint defining aninitial pose P, Pi (e.g., as shown in FIG. 2A) of the robot 100 relativeto a waypoint 210. The robot 100 may be configured to receive this hintautomatically or from an operator of the robot 100. Here, the pose Prefers to a kinematic position and/or orientation of the robot 100. Withthe initial pose Pi of the robot 100 relative to a respective waypoint210, the robot 100 traverses the map 200 according to commands from thetraverse system 116 that instruct the robot 100 to move along edges 220.For example, the map 200 a of FIG. 2A shows the robot 100 moving betweenwaypoints 210 a-f along edged 220 a-f.

In some configurations, the map 200 includes an unprocessed map 202and/or a processed map 204. The unprocessed map 202 is a map 200 thatincludes all the raw or nearly raw sensor data 124 gathered by thesensor system 120 of the robot 100 during generation of the map 200(e.g., shown as points and/or point clouds in FIG. 2A). In contrast, theprocessed map 204 processes sensor data 124 for a waypoint 210 withimmediate neighbors of the waypoint 210. In other words, a processed map204 may contain a greater extent of data, such as data for multiplewaypoints 210 within the robotic environment 110. In some examples, theprocessed map 204 reduces noise near waypoints 210 and edges 220 toincrease the effectiveness for autonomous traversal. For example,referring to the map 200 a of FIG. 2A, the sensor data 124 for waypoint210 a will be processed with all sensor data 124 of neighboringwaypoints 210 b, 210 d. In some examples, the processed map 204 depicts,as a visual image for the processed map 204, points (e.g., volumetricpoints) that correspond to an edge 220. As an example, for a givenwaypoint 210 a, the robot 100 or remote system 140 generating theprocessed map 204 (i.e., the processing system), identifies neighboringwaypoints 210 b, 210 d for the given waypoint 210 a. With the identifiedneighboring waypoints 210 b, 210 d, the traversal system 116 determineswhether three-dimensional points of a three-dimensional point cloudcorresponding the waypoints 210 a, 210 b, 210 d corresponds to a visualedge of an image represented by the three-dimensional point cloud data.Based on this determination, the traversal system 116 associates withthe given waypoint 210 a the three-dimensional points that correspond tothe visual edge of the image represented by the three-dimensional pointcloud data. Additionally or alternatively, the processing for theprocessed map 204 removes any sensor data 124 along an edge 220 that hasnot been observed by the sensor system 120 from multiple vantage points.

FIG. 2B is an example of a map 200 b that uses basin zones around one ormore waypoints 210. Here, a waypoint 210 is configured with acorresponding basin 230. The basin 230 refers to a designated zonearound the waypoint 210 (e.g., shown in FIG. 2B as the area within thedotted circle labeled 230) where the robot 100 uses the ICP algorithm todetermine its movement relative to the waypoint 210. By using the ICPalgorithm, the robot 100 may fine-tune its position. When the robot 100determines that a location L of the robot 100 is outside of the basin230 of a corresponding waypoint 210, the robot 100 is configured to usekinematics and/or inertial measurements to determine the movement of therobot 100. In the example shown, when the robot 100 is at a firstlocation L₁, the robot 100 uses an ICP algorithm to determine themovement of the robot 100. Yet when the robot 100 is at a secondlocation L₂, the robot 100 determines the movement of the robot 100according to kinematics and/or inertial measurements.

In some examples, the area within the waypoint 210 is referred to as agoal zone. Once the robot 100 is within the goal zone, the robot 100 hassuccessfully navigated to the waypoint 210. Upon successful navigationto the waypoint 210 (i.e., entry of the goal zone) the robot 100 mayproceed to move toward a subsequent waypoint 210 along a path of therobot 100.

In some configurations, when a quality of the localization is poor, thetraversal system 116 may cease to autonomously guide the robot 100according to the map 200. This cessation may occur based on the basin230 or based on, for example, a localization threshold (e.g., a locationL from the waypoint 210 where an operator of the robot 100 wouldconsider the robot 100 lost). For instance, the localization thresholdis a distance from a waypoint 210 determined to be outside a range ofthe waypoint 210 to perform localization based on the ICP algorithm.

Additionally or alternatively, the robot 100 may utilize globalpositioning (e.g., a global positioning system (GPS) receiver) whilenavigating according to kinematics, inertial measurements, or the ICPalgorithm. In some examples, the robot 100 first uses a map 200 todetermine an initial heading for the robot 100 (e.g., along an edge 220between waypoints 210), but subsequently supplements navigation (e.g.,supplements kinematics, inertial measurements, or the ICP algorithm)with GPS measurements received at the robot 100 from a GPS receiver. Insome configurations, the computing hardware 110 is configured to receiveGPS measurements (e.g., the computing hardware 110 is configured with aGPS receiver). A supplemental GPS system may be particularly useful whenthe robot 100 is navigating in an outdoor robotic environment 10. Therobot 100 may be configured such that the robot 100 always uses the GPSsystem or utilizes the GPS system to provide navigation inputs when therobot 100 senses a particular robotic environment 10 (e.g., when therobot 100 senses an outdoor environment with less adjacent features).For instance, when the quality of the localization is poor, the robot100 activates and/or uses the GPS system to provide navigational inputs.In some configurations, the GPS system traces the path of the robot 100.In these configurations, the GPS path may be compared to the edges 220on a map 200 to provide feedback to the traversal system 116 (e.g., tofine-tune autonomous navigation using the traversal system 116).

Referring to FIG. 2C, in some implementations, a map 200 c includes mapconstraints 240, 240 a-b. A map constraint 240 refers to a virtualobstacle that prevents the robot 100 from deviating into areasdesignated or blocked with the virtual obstacle. In other words, a mapconstraint 240 may help prevent the robot 100 from significantlydeparting from a movement path corresponding to one or more edges 220.The map constraint 240 may be placed relative to a recorded path,manually added by an operator, or precomputed based on scene geometry.For example, in FIG. 2C, the edges 220 a-c may correspond to a corridor.When the robot 100 recorded the map 200 with waypoints 210 a-c and edges220 a-c corresponding to the corridor, the robot 100 may have never beendriven into rooms and/or doorways on either side of the corridor. It maybe advantageous to block off these rooms at their respective doorways bya first map constraint 240 a and a second map constraint 240 b.Accordingly with the first map constraint 240 a and the second mapconstraint 240 b, the robot 100 should be prevented from wandering intothe rooms when following the edges 220 a-c, thereby preventing the robot100 from becoming lost or off-course.

FIG. 2D shows a map 200 d (e.g., a processed map 204) with atime-indexed robot trajectory 250 that the traversal system 116configures the robot 100 to follow. The time-indexed robot trajectory250 is a movement trajectory for the robot 100 between waypoints 210.The time-indexed robot trajectory 250 may also be referred to as atraversal path 250. Here, FIG. 2D depicts the time-indexed robottrajectory 250 by an arrowhead pointing from a first waypoint 210 awhere the robot 100 is currently positioned (shown as an “X” within thewaypoint 210 a) towards a third waypoint 210 c. To navigate thetime-indexed robot trajectory 250, the robot 100 will traverse edges 220a, 220 b.

In some examples, the traversal system 116 generates a time-indexedrobot trajectory 250 across upcoming waypoints 210 for movement of therobot 100. In some implementations, for the time-indexed robottrajectory 250, the traversal system 116 specifies that an orientationfor the robot 100 at each waypoint 210 is halfway between current andnext edges 220 of a route through a respective waypoint 210. Here, thetime t may be based on an expected time t_(e) to reach each waypoint 210due to the trajectory. As the robot 100 travels the trajectory 250,times t (e.g., the time t₂ to travel from a second waypoint 210 b to thethird waypoint 210 c) for the trajectory 250 may be updated based onupdated estimates of when the robot 100 should reach each waypoint 210.In this configuration, when a time t corresponding to a waypoint 210 isclose to a current time, the waypoint's time is updated. In someexamples, after the current time passes a time associated with thewaypoint 210, the traversal system 116 considers the waypoint 210reached and subsequently removes it from the trajectory.

Additionally or alternatively, as shown in the maps 200 a, 200 c ofFIGS. 2A and 2C, annotations 222 associated with edges 220 may modify anorientation of the robot 100 at waypoints 210 associated with atime-indexed robot trajectory such that the robot 100 conforms with adirectional constraint of the annotation 222. Based on these directionalconstraints, an orientation of the robot 100 may also be estimated for awaypoint 210 within the trajectory. When an orientation estimatedetermines that the orientation will be incorrect in light of thedirectional constraint, an orientation segment (e.g., a turn-in-placesegment) may be added to the time-indexed robot trajectory to ensurethat the robot 100 complies with the directional constraint.

Referring back to FIG. 1 , the behavior system 102 of the robot 100 mayoptionally receive a path description 206 from the traversal system 116that includes goal conditions and constraint conditions for reaching oneor more waypoints 210. Based on these goal conditions and constraintconditions, the robot 100 follows the path description 206 with anability to adjust its route as long as the adjusted route satisfies thegoal and constraint conditions. Some examples of conditions includespecifying a position or orientation for the robot 100 at or around atarget waypoint 210 or specifying a position, orientation, and/or speedfor travel to the target waypoint 210.

FIG. 3 is an example flow diagram of a method 300 to configure a map200. At operation 302, the method 300 receives image data 124 of arobotic environment 10 about a robot 100 maneuvering in the roboticenvironment 10. At operation 304, the method 300 executes at least onewaypoint heuristic 212 where the at least one waypoint heuristic 212 isconfigured to trigger a waypoint placement on a waypoint map 200. Inresponse to the at least one waypoint heuristic 212 triggering thewaypoint placement, at operation 306, the method 300 records a waypoint210 on the waypoint map 200. Here, the waypoint 210 is associated withat least one waypoint edge 220 and includes sensor data 124 obtained bythe sensor system 120 of the robot 100. The at least one waypoint edge220 may include a pose transform expressing how to move between twowaypoints 210.

FIG. 4 is an example flow diagram of method 400 to localize the robot100 with respect to a waypoint map 200. At operation 402, the method 400receives image data 124 of a robotic environment 10 about a robot 100maneuvering in the robotic environment 10. At operation 404, the method400 executes an iterative closest points (ICP) algorithm configured tolocalize to a first waypoint 210 a of the waypoint map 200 based on thereceived image data 124. At operation 406, the method 400 executes atraversal path 250 from the first waypoint 210 a of the waypoint map 200to a second waypoint 210 b of the waypoint map 200. At operation, 404,the method 400 updates the localization to the second waypoint 210 b ofthe waypoint map 200 by the ICP algorithm based on the received imagedata.

FIG. 5 is schematic view of an example computing device 500 that may beused to implement the systems and methods described in this document,for example, the behavior system 102, the computing hardware 110, thetraversal system 116, or 1 the remote resources 142. The computingdevice 500 is intended to represent various forms of digital computers,such as laptops, desktops, workstations, personal digital assistants,servers, blade servers, mainframes, and other appropriate computers. Thecomponents shown here, their connections and relationships, and theirfunctions, are meant to be exemplary only, and are not meant to limitimplementations of the inventions described and/or claimed in thisdocument.

The computing device 500 includes a processor 510, memory 520, a storagedevice 530, a high-speed interface/controller 540 connecting to thememory 520 and high-speed expansion ports 550, and a low speedinterface/controller 560 connecting to a low speed bus 570 and a storagedevice 530. Each of the components 510, 520, 530, 540, 550, and 560, areinterconnected using various busses, and may be mounted on a commonmotherboard or in other manners as appropriate. The processor 510 canprocess instructions for execution within the computing device 500,including instructions stored in the memory 520 or on the storage device530 to display graphical information for a graphical user interface(GUI) on an external input/output device, such as display 580 coupled tohigh speed interface 540. In other implementations, multiple processorsand/or multiple buses may be used, as appropriate, along with multiplememories and types of memory. Also, multiple computing devices 500 maybe connected, with each device providing portions of the necessaryoperations (e.g., as a server bank, a group of blade servers, or amulti-processor system).

The memory 520 stores information non-transitorily within the computingdevice 500. The memory 520 may be a computer-readable medium, a volatilememory unit(s), or non-volatile memory unit(s). The non-transitorymemory 520 may be physical devices used to store programs (e.g.,sequences of instructions) or data (e.g., program state information) ona temporary or permanent basis for use by the computing device 500.Examples of non-volatile memory include, but are not limited to, flashmemory and read-only memory (ROM)/programmable read-only memory(PROM)/erasable programmable read-only memory (EPROM)/electronicallyerasable programmable read-only memory (EEPROM) (e.g., typically usedfor firmware, such as boot programs). Examples of volatile memoryinclude, but are not limited to, random access memory (RAM), dynamicrandom access memory (DRAM), static random access memory (SRAM), phasechange memory (PCM) as well as disks or tapes.

The storage device 530 is capable of providing mass storage for thecomputing device 500. In some implementations, the storage device 530 isa computer-readable medium. In various different implementations, thestorage device 530 may be a floppy disk device, a hard disk device, anoptical disk device, or a tape device, a flash memory or other similarsolid state memory device, or an array of devices, including devices ina storage area network or other configurations. In additionalimplementations, a computer program product is tangibly embodied in aninformation carrier. The computer program product contains instructionsthat, when executed, perform one or more methods, such as thosedescribed above. The information carrier is a computer- ormachine-readable medium, such as the memory 520, the storage device 530,or memory on processor 510.

The high speed controller 540 manages bandwidth-intensive operations forthe computing device 500, while the low speed controller 560 manageslower bandwidth-intensive operations. Such allocation of duties isexemplary only. In some implementations, the high-speed controller 540is coupled to the memory 520, the display 580 (e.g., through a graphicsprocessor or accelerator), and to the high-speed expansion ports 550,which may accept various expansion cards (not shown). In someimplementations, the low-speed controller 560 is coupled to the storagedevice 530 and a low-speed expansion port 590. The low-speed expansionport 590, which may include various communication ports (e.g., USB,Bluetooth, Ethernet, wireless Ethernet), may be coupled to one or moreinput/output devices, such as a keyboard, a pointing device, a scanner,or a networking device such as a switch or router, e.g., through anetwork adapter.

The computing device 500 may be implemented in a number of differentforms, as shown in the figure. For example, it may be implemented as astandard server 500 a or multiple times in a group of such servers 500a, as a laptop computer 500 b, or as part of a rack server system 500 c.

Various implementations of the systems and techniques described hereincan be realized in digital electronic and/or optical circuitry,integrated circuitry, specially designed ASICs (application specificintegrated circuits), computer hardware, firmware, software, and/orcombinations thereof. These various implementations can includeimplementation in one or more computer programs that are executableand/or interpretable on a programmable system including at least oneprogrammable processor, which may be special or general purpose, coupledto receive data and instructions from, and to transmit data andinstructions to, a storage system, at least one input device, and atleast one output device.

These computer programs (also known as programs, software, softwareapplications or code) include machine instructions for a programmableprocessor, and can be implemented in a high-level procedural and/orobject-oriented programming language, and/or in assembly/machinelanguage. As used herein, the terms “machine-readable medium” and“computer-readable medium” refer to any computer program product,non-transitory computer readable medium, apparatus and/or device (e.g.,magnetic discs, optical disks, memory, Programmable Logic Devices(PLDs)) used to provide machine instructions and/or data to aprogrammable processor, including a machine-readable medium thatreceives machine instructions as a machine-readable signal. The term“machine-readable signal” refers to any signal used to provide machineinstructions and/or data to a programmable processor.

The processes and logic flows described in this specification can beperformed by one or more programmable processors executing one or morecomputer programs to perform functions by operating on input data andgenerating output. The processes and logic flows can also be performedby special purpose logic circuitry, e.g., an FPGA (field programmablegate array) or an ASIC (application specific integrated circuit).Processors suitable for the execution of a computer program include, byway of example, both general and special purpose microprocessors, andany one or more processors of any kind of digital computer. Generally, aprocessor will receive instructions and data from a read only memory ora random access memory or both. The essential elements of a computer area processor for performing instructions and one or more memory devicesfor storing instructions and data. Generally, a computer will alsoinclude, or be operatively coupled to receive data from or transfer datato, or both, one or more mass storage devices for storing data, e.g.,magnetic, magneto optical disks, or optical disks. However, a computerneed not have such devices. Computer readable media suitable for storingcomputer program instructions and data include all forms of non-volatilememory, media and memory devices, including by way of examplesemiconductor memory devices, e.g., EPROM, EEPROM, and flash memorydevices; magnetic disks, e.g., internal hard disks or removable disks;magneto optical disks; and CD ROM and DVD-ROM disks. The processor andthe memory can be supplemented by, or incorporated in, special purposelogic circuitry.

To provide for interaction with a user, one or more aspects of thedisclosure can be implemented on a computer having a display device,e.g., a CRT (cathode ray tube), LCD (liquid crystal display) monitor, ortouch screen for displaying information to the user and optionally akeyboard and a pointing device, e.g., a mouse or a trackball, by whichthe user can provide input to the computer. Other kinds of devices canbe used to provide interaction with a user as well; for example,feedback provided to the user can be any form of sensory feedback, e.g.,visual feedback, auditory feedback, or tactile feedback; and input fromthe user can be received in any form, including acoustic, speech, ortactile input. In addition, a computer can interact with a user bysending documents to and receiving documents from a device that is usedby the user; for example, by sending web pages to a web browser on auser's client device in response to requests received from the webbrowser.

A number of implementations have been described. Nevertheless, it willbe understood that various modifications may be made without departingfrom the spirit and scope of the disclosure. Accordingly, otherimplementations are within the scope of the following claims.

What is claimed is:
 1. A legged robot comprising: a body; a plurality oflegs coupled to the body, the plurality of legs comprising a right frontleg, a right hind leg, a left front leg, and a left hind leg; a visionsystem disposed on the body, the vision system comprising: a first imagesensor and a second image sensor located between the right front leg andthe right hind leg and horizontally mounted along a length of a rightside of the body, wherein the first image sensor and the second imagesensor are different types of image sensors; a third image sensor and afourth image sensor located between the left front leg and the left hindleg and horizontally mounted along a length of a left side of the body,wherein the third image sensor and the fourth image sensor are differenttypes of image sensors; and one or more front image sensors locatedbetween the right front leg and the left front leg on a front endportion of the body, wherein the vision system is configured to obtainimage data captured from the first image sensor, the second imagesensor, the third image sensor, the fourth image sensor, and the one ormore front image sensors; and a computing system configured to processthe image data to generate a map for controlling at least one of theright front leg, the right hind leg, the left front leg, or the lefthind leg to maneuver the legged robot about an environment.
 2. Thelegged robot of claim 1, wherein at least one of the first image sensor,the second image sensor, the third image sensor, the fourth imagesensor, or the one or more front image sensors comprises one or more ofa stereo camera, a lidar sensor, or a ladar sensor.
 3. The legged robotof claim 1, wherein at least one of the first image sensor, the secondimage sensor, the third image sensor, the fourth image sensor, or theone or more front image sensors comprises a three-dimensional volumetricimage sensor.
 4. The legged robot of claim 1 further comprising an armcoupled to the body.
 5. The legged robot of claim 1 further comprisingan arm coupled to the body, wherein the vision system further comprisesa movable image sensor disposed on the arm.
 6. The legged robot of claim1, wherein at least one of the first image sensor, the second imagesensor, the third image sensor, the fourth image sensor, or the one ormore front image sensors is pivotable.
 7. The legged robot of claim 1,wherein the vision system further comprises a fifth image sensor locatedbetween the right front leg and the right hind leg or between the leftfront leg and the left hind leg.
 8. The legged robot of claim 1, whereineach of the first image sensor, the second image sensor, the third imagesensor, and the fourth image sensor has a housing with a longitudinalaxis extending along a length of the body on a respective side of thebody.
 9. The legged robot of claim 1, wherein the one or more frontimage sensors comprises a column of image sensors.
 10. The legged robotof claim 1, wherein the one or more front image sensors comprises threeimage sensors located between the right front leg and the left frontleg.
 11. The legged robot of claim 1, wherein the one or more frontimage sensors extend along a front end portion of the body.
 12. Acomputer-implemented method comprising: receiving, by data processinghardware, image data from a vision system disposed on a body of a leggedrobot, the legged robot comprising a right front leg, a right hind leg,a left front leg, and a left hind leg each coupled to the body, whereinreceiving the image data from the vision system comprises: receiving afirst portion of the image data from a first image sensor and a secondimage sensor located between the right front leg and the right hind legand horizontally mounted along a length of a right side of the body,wherein the first image sensor and the second image sensor are differenttypes of image sensors, receiving a second portion of the image datafrom a third image sensor and a fourth image sensor located between theleft front leg and the left hind leg and horizontally mounted along alength of a left side of the body, wherein the third image sensor andthe fourth image sensor are different types of image sensors, andreceiving a third portion of the image data from one or more front imagesensors located between the right front leg and the left front leg on afront end portion of the body; processing, by the data processinghardware, the image data to generate a map for controlling at least oneof the right front leg, the right hind leg, the left front leg, or theleft hind leg to maneuver the legged robot about an environment; andcommunicating, by the data processing hardware, the map to a drivesystem of the legged robot to maneuver the legged robot about theenvironment using the map.
 13. The method of claim 12, wherein receivingthe image data further comprises receiving a fourth portion of the imagedata from a fifth image sensor located between the right front leg andthe right hind leg or between the left front leg and the left hind leg.14. The method of claim 12, wherein each of the first image sensor, thesecond image sensor, the third image sensor, and the fourth image sensorhas a housing with a longitudinal axis extending along a length of thebody on a respective side of the body.
 15. The method of claim 12,wherein the one or more front image sensors extend along a front endportion of the body.
 16. The method of claim 12, wherein at least one ofthe first image sensor, the second image sensor, the third image sensor,the fourth image sensor, or the one or more front image sensorscomprises one or more of a stereo camera, a lidar sensor, or a ladarsensor.
 17. A system comprising: data processing hardware; and memory incommunication with the data processing hardware, the memory storinginstructions that when executed by the data processing hardware causethe data processing hardware to: receive image data from a vision systemdisposed on a body of a legged robot, the legged robot comprising aright front leg, a right hind leg, a left front leg, and a left hind legeach coupled to the body, wherein to receive the image data from thevision system, execution of the instructions by the data processinghardware causes the data processing hardware to: receive a first portionof the image data from a first image sensor and a second image sensorlocated between the right front leg and the right hind leg andhorizontally mounted along a length of a right side of the body, whereinthe first image sensor and the second image sensor are different typesof image sensors, receive a second portion of the image data from athird image sensor and a fourth image sensor located between the leftfront leg and the left hind leg and horizontally mounted along a lengthof a left side of the body, wherein the third image sensor and thefourth image sensor are different types of image sensors, and receive athird portion of the image data from one or more front image sensorslocated between the right front leg and the left front leg on a frontend portion of the body, process the image data to generate a map forcontrolling at least one of the right front leg, the right hind leg, theleft front leg, or the left hind leg to maneuver the legged robot aboutan environment; and communicate the map to a drive system of the leggedrobot to maneuver the legged robot about the environment using the map.18. The system of claim 17, wherein at least one of the first imagesensor, the second image sensor, the third image sensor, the fourthimage sensor, or the one or more front image sensors comprises one ormore of a stereo camera, a lidar sensor, or a ladar sensor.
 19. Thesystem of claim 17, wherein the legged robot further comprises an armcoupled to the body, wherein the vision system comprises a fifth imagesensor disposed on the arm.
 20. The system of claim 17, wherein the oneor more front image sensors comprises a column of image sensors.